<template>
  <!-- 底部部分 -->
  <footer class="footer">
    <span class="todo-count"><strong></strong>剩余{{ leftCount }}</span>
    <ul class="filters" @click="$emit('changeType',type)">
      <li>
        <a
          @click.prevent="type = 'all'"
          :class="{ selected: type === 'all' }"
          href="#/"
          >全部</a
        >
      </li>
      <li>
        <a
          @click.prevent="type = 'active'"
          :class="{ selected: type === 'active' }"
          href="#/active"
          >进行中</a
        >
      </li>
      <li>
        <a
          @click.prevent="type = 'completed'"
          :class="{ selected: type === 'completed' }"
          href="#/completed"
          >已完成</a
        >
      </li>
    </ul>
    <button 
    @click="hClear" 
    v-show="showClear" class="clear-completed">
      清除已完成
    </button>
  </footer>
</template>

<script>
export default {
  name: "TodoFooter",
  props: {
    list: {
      type: Array,
      required: true,
    },
  },
  data() {
    return {
      type: 'all',
    };
  },

  computed: {
    leftCount() {
      return this.list.length;
    },
    showClear() {
      return this.list.some((item) => item.isDone);
    },
  },

  methods: {
    hClear() {
      this.$emit("clearDone");
    },
  },
};
</script>

<style lang="scss" scoped>
</style>